CN115159961A - Method for recycling waste magnesium dry material for continuous casting tundish - Google Patents
Method for recycling waste magnesium dry material for continuous casting tundish Download PDFInfo
- Publication number
- CN115159961A CN115159961A CN202210616418.XA CN202210616418A CN115159961A CN 115159961 A CN115159961 A CN 115159961A CN 202210616418 A CN202210616418 A CN 202210616418A CN 115159961 A CN115159961 A CN 115159961A
- Authority
- CN
- China
- Prior art keywords
- tundish
- magnesium
- balls
- recycling
- converter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000002699 waste material Substances 0.000 title claims abstract description 35
- 239000000463 material Substances 0.000 title claims abstract description 31
- 238000004064 recycling Methods 0.000 title claims abstract description 22
- 238000009749 continuous casting Methods 0.000 title claims abstract description 18
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 title description 6
- 229910052749 magnesium Inorganic materials 0.000 title description 6
- 239000011777 magnesium Substances 0.000 title description 6
- RWDBMHZWXLUGIB-UHFFFAOYSA-N [C].[Mg] Chemical compound [C].[Mg] RWDBMHZWXLUGIB-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000011819 refractory material Substances 0.000 claims abstract description 34
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 31
- 239000002893 slag Substances 0.000 claims abstract description 31
- 239000010959 steel Substances 0.000 claims abstract description 31
- 238000003723 Smelting Methods 0.000 claims abstract description 28
- 239000000203 mixture Substances 0.000 claims abstract description 26
- 239000000440 bentonite Substances 0.000 claims abstract description 25
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 25
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000011230 binding agent Substances 0.000 claims abstract description 24
- 241000143432 Daldinia concentrica Species 0.000 claims abstract description 22
- 238000002156 mixing Methods 0.000 claims abstract description 21
- 239000010459 dolomite Substances 0.000 claims abstract description 18
- 229910000514 dolomite Inorganic materials 0.000 claims abstract description 18
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000003830 anthracite Substances 0.000 claims abstract description 17
- 239000003034 coal gas Substances 0.000 claims abstract description 9
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 238000005453 pelletization Methods 0.000 claims abstract description 9
- 239000008188 pellet Substances 0.000 claims abstract description 8
- 238000005245 sintering Methods 0.000 claims abstract description 8
- 238000000227 grinding Methods 0.000 claims abstract description 7
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 32
- 239000000395 magnesium oxide Substances 0.000 claims description 16
- 238000005096 rolling process Methods 0.000 claims description 13
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 7
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 7
- 229910052739 hydrogen Inorganic materials 0.000 claims description 7
- 229910052760 oxygen Inorganic materials 0.000 claims description 7
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 238000012958 reprocessing Methods 0.000 claims description 6
- 238000010079 rubber tapping Methods 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 2
- 238000007873 sieving Methods 0.000 claims description 2
- 230000007613 environmental effect Effects 0.000 abstract 1
- 238000012216 screening Methods 0.000 description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000003912 environmental pollution Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000010977 jade Substances 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/03—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
- C04B35/04—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
- C04B35/043—Refractories from grain sized mixtures
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/44—Refractory linings
- C21C5/441—Equipment used for making or repairing linings
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3208—Calcium oxide or oxide-forming salts thereof, e.g. lime
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3418—Silicon oxide, silicic acids, or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/349—Clays, e.g. bentonites, smectites such as montmorillonite, vermiculites or kaolines, e.g. illite, talc or sepiolite
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
- C04B2235/422—Carbon
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Structural Engineering (AREA)
- Metallurgy (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
The invention relates to a method for recycling a tundish dry material for continuous casting in a steel plant, belonging to the technical field of recycling of steel smelting refractory secondary resources. The method comprises the following steps: collecting the used refractory materials of the working layer of the waste tundish, and preparing anthracite and bentonite binder; mixing the refractory material of the waste tundish working layer and the anthracite, uniformly mixing, and then grinding by using a ball mill until the granularity is less than 3mm to obtain a mixture; adding a bentonite binder into the mixture, uniformly mixing, and then pelletizing by using a pelletizer to obtain mixed pellets; baking and sintering the mixed balls for 30-40 minutes by adopting a coal gas baking oven, and naturally cooling to room temperature to obtain magnesium carbon balls; in the process of converter smelting or slag splashing protection, the magnesium-carbon balls are used for replacing light-burned dolomite. The method reduces the consumption cost of the refractory materials in steel plants, reduces resource waste, relieves the pressure of environmental protection, and is easy to popularize and apply.
Description
Technical Field
The invention belongs to the technical field of recycling of secondary resources of steel smelting refractory materials, and particularly relates to a method for recycling a dry tundish material for continuous casting in a steel plant.
Background
A large amount of MgO-containing refractory materials are used in the steelmaking production process, and along with the gradual reduction of resources and the increase of national management and control strength, the price of the MgO-containing refractory materials is continuously increased, so that great pressure is brought to the steelmaking production cost. At present, most tundish refractory materials in steel plants use an integral casting molding process, wherein a permanent layer uses a high-alumina casting material (Al) 2 O 3： 60%), the working layer was made of a magnesium dry material (MgO: 70-85% and the content is selected according to the pouring process and the using time), and the average MgO content of the jade steel is 77% by using the magnesium dry material of the tundish working layer. After the pouring is finished, the tundish working layer needs to be replaced, the magnesium dry material used by the original tundish becomes waste refractory material after being replaced, and the waste refractory material is poured out along with the steel slag to become unavailable resource, so that resource waste is caused, and meanwhile, the environment-friendly treatment pressure is increased. Therefore, how to overcome the defects of the prior art is a problem to be solved urgently in the technical field of secondary resource recycling of the steel smelting refractory at present.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a method for recycling a tundish dry type material for continuous casting in a steel plant.
In order to realize the purpose, the technical scheme adopted by the invention is as follows:
a method for recycling a dry tundish material for continuous casting in a steel plant comprises the following steps:
collecting used refractory materials of a working layer of a waste tundish, and preparing anthracite and bentonite binder;
step (2), mixing the refractory material of the working layer of the waste tundish and anthracite according to the mass ratio of 86-88 to 9.5-10.5, and grinding the mixture by using a ball mill until the granularity is less than 3mm to obtain a mixture;
step (3), adding a bentonite binder into the mixture, uniformly mixing, and then pelletizing by using a pelletizer to obtain mixed pellets; the mass ratio of the refractory material of the waste tundish working layer to the bentonite binder is 86-88;
step (4), baking and sintering the mixed balls for 30-40 minutes by adopting a coal gas baking oven, and naturally cooling to room temperature to obtain magnesium carbon balls;
and (5) replacing light-burned dolomite with magnesium-carbon balls in the converter smelting or slag splashing furnace protection process.
Further, in the step (2), it is preferable that after the rolling by the ball mill, the powder is sieved by a sieving machine, and the portion having a particle size of > 3mm is newly charged into the ball mill and rolled.
Further, it is preferable that, in the step (3), the diameter of the mixing ball is 20. + -.3 mm.
Further, in the step (4), it is preferable that the sintered mixed balls after baking are sieved by a screen, and the mixed balls with a diameter of not 20 ± 3mm are returned to the ball mill of the step (2) for reprocessing.
Further, in the step (5), preferably, in the step (5), 150-200kg of magnesium-carbon balls are added into the furnace after the smelting in the converter is started with oxygen and the ignition is successful, and simultaneously the total amount of the added light-burned dolomite is reduced by 500-600kg per furnace; when the end point C is less than or equal to 0.04 percent after smelting in the converter, adding 50-70Kg of magnesium carbon balls into the converter after tapping is finished, regulating slag, and then performing slag splashing protection operation; no addition of the furnace with the end point C of the converter being more than 0.04 percent.
The invention also provides the magnesium-carbon balls prepared by the method for recycling the tundish dry material for continuous casting in the steel plant.
Further, preferably, the magnesium-carbon sphere comprises the following components in percentage by mass:
MgO 74%-77%、C 7%-9%、Al 2 O 3 8%-10%、SiO 2 4%-6%、CaO 1%-3%、H 2 1 to 2 percent of O, and 100 percent of the total. In addition, the magnesium carbon spheres contain inevitable impurities, such as MgO and K 2 O、Na 2 O, which is not a limitation of the present invention.
The bentonite binder used in the present invention is a commercially available product, preferably containing SiO 2 ：66.5%、Al 2 O 3 ：14.7%、CaO:2.3%、MgO：3.4%、K 2 O：0.2%、Na 2 O：0.3%、H 2 O9.3 percent and the balance of other non-metal oxides.
The usage amount of the refractory material of the working layer of the jade steel tundish is 5.5-6.0 tons per piece, and the MgO content: 77 percent. The residual quantity of the working layer of the tundish after use is 4.0-4.5 tons/piece, and the content of residual MgO: 72% -75%; collecting the residual waste working layer refractory material of the used tundish, rolling the residual waste working layer refractory material into granular materials with the granularity of less than 3mm by using a ball mill, and uniformly mixing the granular materials with anthracite and bentonite with the granularity of less than 3mm to prepare spherical materials; baking with coal gas for 30-40min, and cooling to normal temperature; the slag is added into the converter through a material bin, and is used for replacing part of light-burned dolomite and serving as a slag adjusting material for converter slag splashing protection in the converter smelting or slag splashing protection process; finally, the usage amount of light-burned dolomite of converter slagging materials is reduced, the slag splashing furnace protection effect of the semisteel smelting furnace slag under the condition of high FeO is improved, and the comprehensive utilization of waste idle resources is achieved. The compressive strength of the magnesium-carbon ball prepared by the method is 500-700N/ball.
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention mainly combines the use condition of refractory materials of a steel mill, and the magnesium dry castable of the working layer of the tundish is used for manufacturing magnesium carbon balls and is used for converter slagging and slag regulation, thereby improving the recycling of waste resources, saving the cost of the steel mill and achieving the purpose of reducing environmental pollution;
(2) 150-200kg of magnesia carbon balls are added in the smelting process of the converter, the addition amount of lightly-burned dolomite of a slagging material is reduced by 500-600kg per converter, and the slagging cost of the converter is saved by 1.3 yuan per ton; 140 ten thousand tons of steel are produced annually, and the cost can be saved by 182 ten thousand yuan per year.
(3) After the magnesium carbon balls are used, the total slag charge of the converter smelting is reduced by 500-600 Kg/furnace, the slag band iron is reduced by 60 Kg/furnace, and the steel material consumption is reduced by 1.1Kg/t.
(4) Waste secondary resources are disposed, so that the environmental pollution is reduced, and the production cost is reduced.
Detailed Description
The present invention will be described in further detail with reference to examples.
It will be appreciated by those skilled in the art that the following examples are illustrative of the invention only and should not be taken as limiting the scope of the invention. The examples do not specify particular techniques or conditions, and are performed according to the techniques or conditions described in the literature in the art or according to the product specifications. The materials or equipment used are not indicated by manufacturers, and all are conventional products available by purchase.
Example 1
A method for recycling a dry tundish material for continuous casting in a steel plant comprises the following steps:
collecting used refractory materials of a working layer of a waste tundish, and preparing anthracite and bentonite binder;
step (2), mixing the refractory material of the working layer of the waste tundish and the anthracite according to the mass ratio of 87 to 10, and grinding the mixture by a ball mill until the granularity is less than 3mm after the mixture is uniformly mixed to obtain a mixture;
step (3), adding a bentonite binder into the mixture, uniformly mixing, and then pelletizing by using a pelletizer to obtain mixed pellets; the mass ratio of the refractory material of the waste tundish working layer to the bentonite binder is 87:3;
step (4), baking and sintering the mixed balls for 35 minutes by adopting a coal gas baking oven, and naturally cooling to room temperature to obtain magnesium carbon balls;
and (5) replacing light-burned dolomite with magnesium-carbon balls in the converter smelting or slag splashing furnace protection process.
Example 2
A method for recycling a dry tundish material for continuous casting in a steel plant comprises the following steps:
collecting used refractory materials of a working layer of a waste tundish, and preparing anthracite and bentonite binder;
step (2), mixing the refractory material of the working layer of the waste tundish and the anthracite according to the mass ratio of 86.5, and grinding the mixture by using a ball mill until the granularity is less than 3mm after the mixture is uniformly mixed to obtain a mixture;
step (3), adding a bentonite binder into the mixture, uniformly mixing, and then pelletizing by using a pelletizer to obtain mixed pellets; the mass ratio of the refractory material of the waste tundish working layer to the bentonite binder is 86.8;
step (4), baking and sintering the mixed balls for 30 minutes by adopting a coal gas baking oven, and naturally cooling to room temperature to obtain magnesium carbon balls;
and (5) replacing light-burned dolomite with magnesium-carbon balls in the converter smelting or slag splashing furnace protection process.
And (2) screening by using a screening machine after rolling by using a ball mill, and putting the part with the granularity larger than 3mm into the ball mill again for rolling.
In the step (3), the diameter of the mixed ball is 20 +/-3 mm.
In the step (4), the baked and sintered mixed balls are screened by a screen, and the mixed balls with the diameter of not 20 +/-3 mm are returned to the ball mill in the step (2) for reprocessing.
In the step (5), 150kg of magnesium carbon balls are added into the converter after smelting, oxygen is turned on and ignition is successful, and the total amount of the added light-burned dolomite is reduced by 500kg per converter; when the end point C is less than or equal to 0.04 percent after the converter smelting, adding 50Kg of magnesium carbon balls into the converter after tapping, regulating slag, and then performing slag splashing furnace protection operation; no heat is added when the end point C of the converter is more than 0.04 percent.
The magnesium-carbon sphere prepared in the embodiment comprises the following components in percentage by mass:
MgO 74%、C 7%、Al 2 O 3 8%、SiO 2 6% 、CaO 3%、H 2 o2%, and 100% in total.
Example 3
A method for recycling a dry tundish material for continuous casting in a steel plant comprises the following steps:
collecting used refractory materials of a working layer of a waste tundish, and preparing anthracite and bentonite binder;
step (2), mixing the refractory material of the working layer of the waste tundish and the anthracite according to the mass ratio of 88.5, and grinding the mixture by a ball mill until the granularity is less than 3mm after the mixture is uniformly mixed to obtain a mixture;
step (3), adding a bentonite binder into the mixture, uniformly mixing, and then pelletizing by using a pelletizer to obtain mixed pellets; the mass ratio of the refractory material of the waste tundish working layer to the bentonite binder is 88.2;
step (4), baking and sintering the mixed balls for 40 minutes by adopting a coal gas baking oven, and naturally cooling to room temperature to obtain magnesium carbon balls;
and (5) replacing light-burned dolomite with magnesium-carbon balls in the converter smelting or slag splashing furnace protection process.
And (2) screening by using a screening machine after rolling by using a ball mill, and putting the part with the granularity larger than 3mm into the ball mill again for rolling.
In the step (3), the diameter of the mixed ball is 20 +/-3 mm.
In the step (4), the baked and sintered mixed balls are screened by a screen, and the mixed balls with the diameter of not 20 +/-3 mm are returned to the ball mill in the step (2) for reprocessing.
In the step (5), 200kg of magnesium-carbon balls are added into the converter after oxygen is turned on for smelting and ignition is successful, and the total amount of the added light-burned dolomite is reduced by 600kg per converter; when the end point C is less than or equal to 0.04 percent after the converter smelting, adding 70Kg of magnesium carbon balls into the converter after the tapping is finished, regulating slag, and then performing slag splashing protection operation; no addition of the furnace with the end point C of the converter being more than 0.04 percent.
The magnesium-carbon sphere prepared in the embodiment comprises the following components in percentage by mass:
MgO 77%、C 9%、Al 2 O 3 8%%、SiO 2 4% 、CaO 1%、H 2 o1%, and 100% in total.
Example 4
A method for recycling a dry tundish material for continuous casting in a steel plant comprises the following steps:
collecting used refractory materials of a working layer of a waste tundish, and preparing anthracite and bentonite binder;
step (2), mixing the refractory material of the working layer of the waste tundish and the anthracite according to the mass ratio of 87 to 10, and grinding the mixture by a ball mill until the granularity is less than 3mm after the mixture is uniformly mixed to obtain a mixture;
step (3), adding a bentonite binder into the mixture, uniformly mixing, and then pelletizing by using a pelletizer to obtain mixed pellets; the mass ratio of the refractory material of the waste tundish working layer to the bentonite binder is 87;
step (4), baking and sintering the mixed balls for 30-40 minutes by adopting a coal gas baking oven, and naturally cooling to room temperature to obtain magnesium carbon balls;
and (5) replacing light-burned dolomite with magnesium-carbon balls in the converter smelting or slag splashing furnace protection process.
And (2) screening by using a screening machine after rolling by using a ball mill, and putting the part with the granularity larger than 3mm into the ball mill again for rolling.
In the step (3), the diameter of the mixed ball is 20 +/-3 mm.
In the step (4), the baked and sintered mixed balls are screened by a screen, and the mixed balls with the diameter of not 20 +/-3 mm are returned to the ball mill in the step (2) for reprocessing.
In the step (5), 160kg of magnesium carbon balls are added into the converter after smelting, oxygen is turned on and ignition is successful, and the total amount of the added light-burned dolomite is reduced by 570kg per converter; when the end point C is less than or equal to 0.04 percent after the converter smelting, adding 65Kg of magnesium carbon balls into the converter after the tapping is finished, regulating slag, and then performing slag splashing and furnace protection operation; no heat is added when the end point C of the converter is more than 0.04 percent.
The magnesium-carbon sphere prepared in the embodiment comprises the following components in percentage by mass:
MgO 75%、C 8%、Al 2 O 3 10%、SiO 2 5% 、CaO 1%、H 2 o1%, and 100% in total.
Example 5
A method for recycling a dry tundish material for continuous casting in a steel plant comprises the following steps:
collecting used refractory materials of a working layer of a waste tundish, and preparing anthracite and bentonite binder;
step (2), mixing the refractory material of the working layer of the waste tundish and the anthracite according to the mass ratio of 86.5 to 9.8, and rolling by using a ball mill until the granularity is less than 3mm after uniformly mixing to obtain a mixture;
step (3), adding a bentonite binder into the mixture, uniformly mixing, and then pelletizing by using a pelletizer to obtain mixed pellets; the mass ratio of the refractory material of the waste tundish working layer to the bentonite binder is 86.5;
step (4), baking and sintering the mixed balls for 35 minutes by adopting a coal gas baking oven, and naturally cooling to room temperature to obtain magnesium carbon balls;
and (5) replacing light-burned dolomite with magnesium-carbon balls in the converter smelting or slag splashing furnace protection process.
And (2) screening by using a screening machine after rolling by using a ball mill, and putting the part with the granularity larger than 3mm into the ball mill again for rolling.
In the step (3), the diameter of the mixed ball is 20 +/-3 mm.
In the step (4), the baked and sintered mixed balls are screened by a screen, and the mixed balls with the diameter of not 20 +/-3 mm are returned to the ball mill in the step (2) for reprocessing.
In the step (5), 170kg of magnesium carbon balls are added into the converter after smelting, oxygen is turned on and ignition is successful, and the total amount of the added light-burned dolomite is reduced by 550kg per converter; when the end point C is less than or equal to 0.04 percent after the converter smelting, 60Kg of magnesium carbon balls are added into the converter after the tapping is finished, slag is adjusted in the converter, and then slag splashing furnace protection operation is carried out; no addition of the furnace with the end point C of the converter being more than 0.04 percent.
The magnesium-carbon sphere prepared in the embodiment comprises the following components in percentage by mass:
MgO 76%、C 7.5%、Al 2 O 3 9%、SiO 2 4% 、CaO 2%、H 2 o1.5%, and the total is 100%.
After the scheme of the embodiment of the invention is adopted, the addition of the light-burned dolomite of the slagging material is reduced by 500-600 kg/furnace, and the converter slagging cost is saved by 1.3 yuan/ton; the total slag charge is reduced by 500-600 kg/furnace, and the consumption of iron and steel materials is reduced by 1.1kg/t; meanwhile, waste secondary resources are disposed, so that the environmental pollution is reduced, and the production cost is reduced. In addition, after the magnesium carbon balls are used, the smelting end point of the converter is improved, the phenomenon of drawing and post-blowing is reduced, and the reduction of inclusions in steel is beneficial to improving the quality of steel products.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. A method for recycling a dry tundish material for continuous casting in a steel plant is characterized by comprising the following steps:
collecting used refractory materials of a working layer of a waste tundish, and preparing anthracite and bentonite binder;
step (2), mixing the refractory material of the working layer of the waste tundish and anthracite according to the mass ratio of 86-88 to 9.5-10.5, and grinding the mixture by using a ball mill until the granularity is less than 3mm to obtain a mixture;
step (3), adding a bentonite binder into the mixture, uniformly mixing, and then pelletizing by using a pelletizing machine to obtain mixed pellets; the mass ratio of the refractory material of the waste tundish working layer to the bentonite binder is 86-88;
step (4), baking and sintering the mixed balls for 30-40 minutes by adopting a coal gas baking oven, and naturally cooling to room temperature to obtain magnesium carbon balls;
and (5) replacing light-burned dolomite with magnesium-carbon balls in the converter smelting or slag splashing furnace protection process.
2. The method for recycling the tundish dry material for steel mill continuous casting according to claim 1, wherein in the step (2), after the ball mill rolling, the tundish dry material is sieved by a sieving machine, and the part with the particle size larger than 3mm is thrown into the ball mill again for rolling.
3. The method for recycling tundish dry material for steel mill continuous casting according to claim 1, wherein in step (3), the diameter of the mixing ball is 20 ± 3mm.
4. The method for recycling the tundish dry material for steel mill continuous casting according to claim 1, wherein in the step (4), the baked and sintered mixed balls are screened by a screen, and the mixed balls with the diameter of not 20 +/-3 mm are returned to the ball mill in the step (2) for reprocessing.
5. The method for recycling the tundish dry material for the continuous casting of the steel mill according to claim 1, wherein in the step (5), 150-200kg of the magnesia carbon balls are added into the furnace after the converter smelting is started to be ignited successfully, and the total amount of the light-burned dolomite is reduced by 500-600kg per furnace; when the end point C is less than or equal to 0.04 percent after smelting in the converter, adding 50-70Kg of magnesium carbon balls into the converter after tapping is finished, regulating slag, and then performing slag splashing protection operation; no addition of the furnace with the end point C of the converter being more than 0.04 percent.
6. The magnesium-carbon spheres produced by the method of recycling tundish dry feed for continuous casting in a steel mill of claim 1~5.
7. The magnesium-carbon sphere according to claim 6, which comprises the following components in percentage by mass:
MgO 74%-77%、C 7%-9%、Al 2 O 3 8%-10%、SiO 2 4%-6% 、CaO 1%-3%、H 2 1 to 2 percent of O and 100 percent of the total.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210616418.XA CN115159961B (en) | 2022-06-01 | 2022-06-01 | Method for recycling waste magnesium dry material for continuous casting tundish |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210616418.XA CN115159961B (en) | 2022-06-01 | 2022-06-01 | Method for recycling waste magnesium dry material for continuous casting tundish |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115159961A true CN115159961A (en) | 2022-10-11 |
| CN115159961B CN115159961B (en) | 2024-02-13 |
Family
ID=83483912
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210616418.XA Active CN115159961B (en) | 2022-06-01 | 2022-06-01 | Method for recycling waste magnesium dry material for continuous casting tundish |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115159961B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116356102A (en) * | 2023-03-02 | 2023-06-30 | 攀钢集团西昌钢钒有限公司 | Slag-forming material for converter blowing, preparation method and converter blowing method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009263742A (en) * | 2008-04-28 | 2009-11-12 | Jfe Steel Corp | Method for reusing used tundish refractory |
| US20180187276A1 (en) * | 2016-12-30 | 2018-07-05 | Ism, Inc. | Slag Conditioner |
| CN109133949A (en) * | 2018-09-21 | 2019-01-04 | 山西通才工贸有限公司 | A kind of utilization method of magnesia waste material |
| CN110157859A (en) * | 2019-04-18 | 2019-08-23 | 河钢股份有限公司承德分公司 | Finishing slag adjusting material and its application method for semisteel smelting splashing slag in converter |
| CN111925189A (en) * | 2020-06-30 | 2020-11-13 | 辽宁东和新材料股份有限公司 | Composite magnesia carbon brick and preparation method thereof |
-
2022
- 2022-06-01 CN CN202210616418.XA patent/CN115159961B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009263742A (en) * | 2008-04-28 | 2009-11-12 | Jfe Steel Corp | Method for reusing used tundish refractory |
| US20180187276A1 (en) * | 2016-12-30 | 2018-07-05 | Ism, Inc. | Slag Conditioner |
| CN109133949A (en) * | 2018-09-21 | 2019-01-04 | 山西通才工贸有限公司 | A kind of utilization method of magnesia waste material |
| CN110157859A (en) * | 2019-04-18 | 2019-08-23 | 河钢股份有限公司承德分公司 | Finishing slag adjusting material and its application method for semisteel smelting splashing slag in converter |
| CN111925189A (en) * | 2020-06-30 | 2020-11-13 | 辽宁东和新材料股份有限公司 | Composite magnesia carbon brick and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 本钢板材股份有限公司检化验中心: "钢铁工业节能减排新技术5000问", 中国科学技术出版社, pages: 180 - 181 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116356102A (en) * | 2023-03-02 | 2023-06-30 | 攀钢集团西昌钢钒有限公司 | Slag-forming material for converter blowing, preparation method and converter blowing method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115159961B (en) | 2024-02-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102181610B (en) | Composite slagging agent for making semisteel, and preparation method and using method thereof | |
| CN106591575B (en) | Low energy consumption coal-pressing ball and preparation method thereof | |
| CN104046773B (en) | A kind of dedusting steel-smelting converter ash produces cooled agglomerated pellet processing method | |
| CN108950189B (en) | method for producing MgO-containing sintered ore by using waste magnesia carbon bricks | |
| CN101270410A (en) | Cold bonded pellet and method of producing the same | |
| CN108070713B (en) | Iron ore sintering method using light-burned magnesium balls | |
| CN103451373B (en) | Magnesium ball used for converter steelmaking and production technology thereof | |
| CN104131130A (en) | Converter final-slag modifier and use thereof | |
| CN109652643A (en) | High quality sinter and preparation method thereof for COREX ironmaking technique of fusion and reduction | |
| CN115159961A (en) | Method for recycling waste magnesium dry material for continuous casting tundish | |
| CN110079665B (en) | Preparation method of high-carbon metallized pellets for electric furnace | |
| CN110331242B (en) | Method for preparing slag blocking cone for converter by adding ferrochromium slag | |
| CN101550465A (en) | Manganese-based fluxing agent for converter steelmaking and preparation method thereof | |
| CN116042963A (en) | Method for preparing refining slag former from casting residues | |
| CN112853090B (en) | Method for realizing resource utilization of chromium-containing waste residue composite pellets by adopting sintering method | |
| CN112981049A (en) | Heating slag melting agent for steelmaking and preparation method thereof | |
| CN113736992A (en) | Limestone type fluxed pellet produced by adding fluorine-containing magnetite concentrate and preparation method thereof | |
| CN108929931B (en) | Desiliconization agent for pretreatment of molten iron outside blast furnace and preparation and use methods thereof | |
| CN115626814B (en) | Converter large fabric produced by using magnesite tailing powder and preparation method thereof | |
| CN115522013B (en) | Method for effectively solving converter slag re-drying problem and converter re-drying inhibitor | |
| CN116622928A (en) | Converter smelting method using waste steel refractory and blast furnace dust as slag-making materials | |
| KR20120111249A (en) | Binder for manufacturing fe-containing briquettes using electric furnace reduction slag and manufacturing method thereof | |
| CN117845015A (en) | Manganese-based slag-less smelting promoter | |
| CN112080634A (en) | Acidic pellet binder and preparation method thereof | |
| CN117165763A (en) | Method for improving use proportion of low-reducibility lump ore in iron-making system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |